OpenAI launches Ultrafast mode for GPT-5.6 Sol with 14x speed increase

OpenAI announced a new mode called Ultrafast for its most powerful model, GPT-5.6 Sol, achieving up to 14 times standard processing speed, generating up to 750 output tokens per second. The mode is powered by OpenAI's partnership with chipmaker Cerebras and currently available in preview to a small group of customers, with expanded access planned as capacity grows. OpenAI positions Ultrafast as progress in delivering more useful work per second without sacrificing the capabilities of larger models, contrasting with competitors who typically offer smaller models for speed. The company suggests applications in incident response, customer support, financial market analysis, and e-commerce.